Method and device for detecting and locating head wave of ultrasonic wave
An ultrasonic and signal sequence technology, applied in the field of signal processing, can solve the problems of great influence on measurement accuracy, difficult first wave detection, system noise confusion, etc., and achieves strong anti-interference ability, large singular spectrum entropy drop, and steep edges. Effect
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[0031] The specific embodiment of the present invention is described in detail below in conjunction with accompanying drawing:
[0032] Since the singular spectral entropy has the following characteristics:
[0033] 1) The singular spectral entropy of the signal is different from the singular spectral entropy of the noise.
[0034] 2) Theoretically, if the distribution of the spectrum remains unchanged, the magnitude of the signal amplitude will not affect the singular spectral entropy. In fact, the singular spectral entropy will vary with the randomness of the signal, but compared with the energy signature, the singular spectral entropy changes very little.
[0035] 3) The singular spectral entropy is robust to noise, and the shape of the singular spectral entropy remains unchanged when the signal-to-noise ratio (SNR) decreases. The core idea of the present invention is based on the singular value decomposition theory, which performs singular value decomposition on the tr...
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